[3.14] pythongh-116749: Fix code comment for _PyConfig_GIL_DEFAULT (pythongh-141804) (pythongh-141911)

(cherry picked from commit c490ffb)

Co-authored-by: Sam Gross <colesbury@gmail.com>

Author: miss-islington

Include/internal/pycore_initconfig.h

@@ -153,10 +153,8 @@ typedef enum {
 } _PyConfigInitEnum;
 
 typedef enum {
-    /* For now, this means the GIL is enabled.
-
-       gh-116329: This will eventually change to "the GIL is disabled but can
-       be re-enabled by loading an incompatible extension module." */
+    /* In free threaded builds, this means that the GIL is disabled at startup,
+       but may be enabled by loading an incompatible extension module. */
     _PyConfig_GIL_DEFAULT = -1,
 
     /* The GIL has been forced off or on, and will not be affected by module loading. */